The polarimetric performance of HARPS3 and its impact on the Terra Hunting Experiment scheduling

Patrick Dorval; Ioannis Politopoulos; Belinda Nicholson; Rik ter Horst; Casper Farret Jentink; Baptiste Klein; Jan Kragt; Annelies Mortier; Ramón Navarro; Tim Naylor; Jan Rinze Peterzon; Nikolai Piskunov; Federica Rescignio; Samantha Thompson

doi:10.1117/12.3018722

18 July 2024 The polarimetric performance of HARPS3 and its impact on the Terra Hunting Experiment scheduling

Patrick Dorval, Ioannis Politopoulos, Belinda Nicholson, Rik ter Horst, Casper Farret Jentink, Baptiste Klein, Jan Kragt, Annelies Mortier, Ramón Navarro, Tim Naylor, Jan Rinze Peterzon, Nikolai Piskunov, Federica Rescignio, Samantha Thompson

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130968C (2024) https://doi.org/10.1117/12.3018722
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The main goal of the third iteration of the High Accuracy Radial velocity Planet Searcher (HARPS3) is to search for Earth-like planets over a ten-year programme. As part of this search, spectropolarimetric observations have been envisioned foreseeing the need for new ways to reduce stellar activity jitter which obscures the 10 cm/sec radial velocity signal of such planets. HARPS3 has thus been designed with an insertable polarimetric sub-unit. This sub-unit consists of two superachromatic polymer retarders, one quarter-wave and one half-wave, to separately detect all Stokes parameters of a target, as well as a polarimetric beam splitter to separate the parallel polarimetric beams by 30 mm to feed the science fibers. In this paper we report on the currently nonfunctional polarimetric sub-unit of the HARPS3 spectrograph and discuss the upgrade expected before commissioning that will fix current issues. We discuss the possible observation schedule of polarimetric observations for the Terra Hunting Experiment and the potential impacts of polarimetric observations on mitigating stellar radial velocity jitter.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Patrick Dorval, Ioannis Politopoulos, Belinda Nicholson, Rik ter Horst, Casper Farret Jentink, Baptiste Klein, Jan Kragt, Annelies Mortier, Ramón Navarro, Tim Naylor, Jan Rinze Peterzon, Nikolai Piskunov, Federica Rescignio, and Samantha Thompson "The polarimetric performance of HARPS3 and its impact on the Terra Hunting Experiment scheduling", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130968C (18 July 2024); https://doi.org/10.1117/12.3018722

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